利用非稳定流求解潜水水文地质参数的降深比值6点法

Six Point Method of Drawdown Ratio for Solving Hydrogeological Parameters of Phreatic Water under Unsteady Flow Condition

利用Boulton井流公式求解潜水非稳定流条件下的水文地质参数,是涉及4个未知数的超越方程,无法通过常规的解析法直接获解.传统的图解法不但受图表束缚,而且求解过程繁复、成果精度存在人为误差.文中采用优化拟合方法,在工程适用参数范围内,用较为简单的函数完成了由图表给出的井函数数值关系的替代,并利用降深比值关系,通过选取水位降深曲线上的6个点,经整理获得了仅含1个未知量的表达式,经简单试算即可完成参数求解,结果更接近工程实际,且计算过程简捷,不依赖图表,便于实际工程应用.

During solving hydrogeological parameters of phreatic water under unsteady flow Condition by Boulton well-flow formulas,the transcendental equations containing four unknown numbers are involved,which are not directly solved by the conventional analytical method. Not only the traditional descriptive geometry solution is bounded by charts,but also the solution procedure is complicated,and the precision of results is affected by personality errors. In this article,the optimal fitting method was used to finish the replacement of magnitude relation of well function given by charts with simpler functions,the expressions containing one unknown number were obtained through utilizing the relation of drawdown ratio and selecting six points in drawdown curves,the parameter solving was completed through simple and tentative calculation,and the solutions were much more approximate to the practice,the solution procedure was simple,did not rely on charts,and was convenient for practical application.